Definition: You are given a math word problem and you are supposed to make use of mathematical concepts like probability, combinatorics, linear equations, sequences/series, or simple operators like addition, subtraction, division, or multiplication to answer the given question. Choose the best option from the 5 given options and report that option.
Input: Question: A train 250 m long running at 72 kmph crosses a platform in 30 sec. What is the length of the platform?

 Option A: 350m

 Option B: 200m

 Option C: 250m

 Option D: 270m

 Option E: 300 m

Option A